VB.Net Tutorial/2D Graphics/Bitmap
Содержание
Create an Bitmap and paint on it
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms Imports System.Math public class CreateBitmap
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class public class Form1
Inherits System.Windows.Forms.Form
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim bm As New Bitmap("yourfile.jpg")
Dim new_bm As New Bitmap(bm)
bm.Dispose()
Dim gr As Graphics = Graphics.FromImage(new_bm)
gr.DrawEllipse(Pens.White, 0, 0, new_bm.Width - 1, new_bm.Height - 1)
e.Graphics.DrawImage(new_bm,0,0,400,400)
End Sub
Private Sub InvertImage(ByVal bm As Bitmap)
For y As Integer = 0 To bm.Height - 1
For x As Integer = 0 To bm.Width - 1
Dim clr As Color = bm.GetPixel(x, y)
clr = Color.FromArgb(255,255 - clr.R, 255 - clr.G, 255 - clr.B)
bm.SetPixel(x, y, clr)
Next x
Next y
End Sub
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
End Sub
End Class</source>
Create Bitmap from Icon
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class DrawIcons
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class
Public Class Form1
Inherits System.Windows.Forms.Form
- Region " Windows Form Designer generated code "
Public Sub New()
MyBase.New()
"This call is required by the Windows Form Designer.
InitializeComponent()
"Add any initialization after the InitializeComponent() call
End Sub
"Form overrides dispose to clean up the component list.
Protected Overloads Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing Then
If Not (components Is Nothing) Then
components.Dispose()
End If
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> Private Sub InitializeComponent()
"
"Form1
"
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(344, 273)
Me.Name = "Form1"
Me.Text = "Form1"
End Sub
- End Region
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
" Create an Icon
Dim curIcon As New Icon("1.ico")
" Create a Bitmap from Icon
Dim bmp As Bitmap = curIcon.ToBitmap()
" Draw Bitmap
Dim g As Graphics = e.Graphics
g.Clear(Me.BackColor)
g.DrawImage(bmp, 10, 10)
g.Dispose()
End Sub
End Class</source>
Make Bitmap transparent
<source lang="vbnet">Imports System.Windows.Forms Imports System.Drawing Imports System.Drawing.Drawing2D public class MakeTransparentBitmap
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class Public Class Form1
Private Sub Form1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Click
Me.Close()
End Sub
Private Sub Form1_Paint(ByVal sender As Object, ByVal e As System.Windows.Forms.PaintEventArgs) Handles Me.Paint
Dim bm As Bitmap = new Bitmap("yourfile.jpg")
bm.MakeTransparent(bm.GetPixel(1, 1))
e.Graphics.DrawImage(bm, 0, 0)
End Sub
End Class <Global.Microsoft.VisualBasic.rupilerServices.DesignerGenerated()> _ Partial Public Class Form1
Inherits System.Windows.Forms.Form
"Form overrides dispose to clean up the component list.
<System.Diagnostics.DebuggerNonUserCode()> _
Protected Overrides Sub Dispose(ByVal disposing As Boolean)
If disposing AndAlso components IsNot Nothing Then
components.Dispose()
End If
MyBase.Dispose(disposing)
End Sub
"Required by the Windows Form Designer
Private components As System.ruponentModel.IContainer
"NOTE: The following procedure is required by the Windows Form Designer
"It can be modified using the Windows Form Designer.
"Do not modify it using the code editor.
<System.Diagnostics.DebuggerStepThrough()> _
Private Sub InitializeComponent()
Me.SuspendLayout()
"
"Form1
"
Me.AutoScaleDimensions = New System.Drawing.SizeF(6.0!, 13.0!)
Me.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font
Me.ClientSize = New System.Drawing.Size(203, 201)
Me.ControlBox = False
Me.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None
Me.Name = "Form1"
Me.TransparencyKey = System.Drawing.SystemColors.Control
Me.ResumeLayout(False)
End Sub
End Class</source>
Set Pixel for Bitmap
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class SetPixelImage
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class public class Form1
Inherits System.Windows.Forms.Form
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim newImage As Bitmap = Bitmap.FromFile("yourfile.jpg")
Dim i As Integer
For i = 0 To 59
Dim j As Integer
For j = 0 To 59
newImage.SetPixel(i, j, Color.Red)
Next j
Next i
e.Graphics.DrawImage(newImage, Me.ClientRectangle)
End Sub
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
End Sub
End Class</source>
Set Resolution for Bitmap
<source lang="vbnet">Imports System.Drawing Imports System.Drawing.Drawing2D Imports System.Windows.Forms public class SetResolutionBitmap
public Shared Sub Main
Application.Run(New Form1)
End Sub
End class public class Form1
Inherits System.Windows.Forms.Form
Protected Overrides Sub OnPaint(ByVal e As PaintEventArgs)
Dim newImage As Bitmap = Bitmap.FromFile("yourfile.jpg")
Dim hDpi As Single = 90
Dim vDpi As Single = 90
newImage.SetResolution(hDpi, vDpi)
e.Graphics.DrawImage(newImage, Me.ClientRectangle)
End Sub
Public Sub New()
MyBase.New()
Me.AutoScaleBaseSize = New System.Drawing.Size(5, 13)
Me.ClientSize = New System.Drawing.Size(292, 273)
Me.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen
End Sub
End Class</source>
